Malicious PDF — malware analysis report

Static analysis result for SHA-256 c053a4cafd7569f2…

MALICIOUS

PDF

85.3 KB Created: 2021-09-06 01:50:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 71661450174aa5f466389eaa58826a40 SHA-1: 00fbd529adbfc639dc6da3df0c254cd61a9fbcd4 SHA-256: c053a4cafd7569f21b75b84edd00ab1a48caaeedd7d293974e88ea606ddedda7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, but the overall structure and URL findings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160e481ea6d76f---lonafipel.pdf In PDF document text
    • http://naturpix.ch/cmsimages/file/65944440243.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/4fjqmhed8jcbts9rd03pk3l91m/pujim.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/21eada744d051c16ff721a804a17083f/jasogixato.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c39d0818437---linewuzotojodenizu.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab69255d757---81808011414.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/babojofuxodiraxijuf.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/b7819e91e435936a1b8e136b473f73bc/8941190706.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/f04f3e8a0227e7f0f1488cc5c1b2a12a/97727617889.pdfIn PDF document text
    • https://tycoonmarine.com/userfiles/files/79916523254.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/16e89e1d97374a33c25f983325a4d208/63682760120.pdfIn PDF document text
    • https://stl-log.com/htdocs/cljr/data/files/tasowuxuguvutorelujewavo.pdfIn PDF document text
    • http://movementlab.dk/userfiles/file/36069281902.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a53e7fda519---xoxizudilinimom.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/91413877504.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0fa51f11ee---nidotazasemebenux.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/gasesonisavenuno.pdfIn PDF document text
    • http://truhlarstvisollner.cz/data/file/39748027573.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160908b209aa75---74385787998.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/mimeserevufofepore.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/41560049204.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/452f1552c8be497f775bbd2b8f90e569/72631928683.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/cokuu5i780clrju4q8td2to9ik/mulukud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=cours+bascule+logique+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e11b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE11B 20860 bytes
SHA-256: c0b5e708c5cea59170bc9c6f03fe3d8b714e659c13126777b77758ce9ced0586
font_01_sfnt_off00011632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11632 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E49 11012 bytes
SHA-256: 90c85bf872eb89032480823081524b621d94f6bc934f19b0348773c3ad4868b2

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